https://tvtropes.org/pmwiki/pmwiki.php/Characters/CaptainPlanetAndThePlaneteers
The show has been around for 30 years and we all just assumed we knew where they were from.
Kwame is from Ghana and the de-facto leader. Wheeler is American, from New York. Linka is from the former Soviet Union, and modern-day Russia (possibly Russian/Ukrainian mixed.) Gi is from South Korea; specifically the surfing city of Busan (possibly Korean/Japanese mixed.) And Ma-ti is a Native American from Brazil (specifically Kayapo.)
there doesn't seem to be anything here